155181497 has 2 divisors, whose sum is σ = 155181498. Its totient is φ = 155181496.

The previous prime is 155181449. The next prime is 155181541. The reversal of 155181497 is 794181551.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117592336 + 37589161 = 10844^2 + 6131^2 .

It is a cyclic number.

It is not a de Polignac number, because 155181497 - 2¹² = 155177401 is a prime.

It is a super-2 number, since 2×155181497² = 48162594022322018, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155181097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77590748 + 77590749.

It is an arithmetic number, because the mean of its divisors is an integer number (77590749).

Almost surely, 2^155181497 is an apocalyptic number.

It is an amenable number.

155181497 is a deficient number, since it is larger than the sum of its proper divisors (1).

155181497 is an equidigital number, since it uses as much as digits as its factorization.

155181497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 41.

The square root of 155181497 is about 12457.1865603755. The cubic root of 155181497 is about 537.3781192552.

The spelling of 155181497 in words is "one hundred fifty-five million, one hundred eighty-one thousand, four hundred ninety-seven".